Fix invalidating built-ins psi in consecutive test runs

idea/src/org/jetbrains/jet/plugin/references/BuiltInsReferenceResolver.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2013 JetBrains s.r.o.
+ * Copyright 2010-2014 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,6 +33,7 @@ import com.intellij.util.Function;
 import com.intellij.util.containers.ContainerUtil;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
+import org.jetbrains.annotations.TestOnly;
 import org.jetbrains.jet.asJava.LightClassUtil;
 import org.jetbrains.jet.context.ContextPackage;
 import org.jetbrains.jet.context.GlobalContextImpl;
@@ -80,6 +81,11 @@ public class BuiltInsReferenceResolver extends AbstractProjectComponent {
         });
     }
 
+    @TestOnly
+    public Set<JetFile> getBuiltInsSources() {
+        return builtInsSources;
+    }
+
     private void initialize() {
         assert bindingContext == null : "Attempt to initialize twice";